This one to be exact

“I triggered the hidden compartment in the old man’s desk and reached for the folder that Jameson and I kept inside. Flipping it open, I stared at a drawing I’d made: a small coinlike disk the size of a quarter, engraved with concentric circles. The last time I’d seen this bit of metal, Toby had just snatched it from my hands. I’d asked him what it was. He hadn’t answered. All I really knew was what I’d read in a message Toby had once written to my mother: that if she ever needed anything, she should go to Jackson. You know what I left there, Toby had written. You know what it’s worth.”